From 9ea5e66a2a81d88e14bb23a319fe496e2782793b Mon Sep 17 00:00:00 2001
From: Miguel Jimenez Esun <mjimenez@fb.com>
Date: Thu, 22 Feb 2018 23:09:12 +0000
Subject: [PATCH] Force haste map regeneration on deserialization error

---
 packages/jest-haste-map/src/index.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/packages/jest-haste-map/src/index.js b/packages/jest-haste-map/src/index.js
index 4af29b1c25ef..86c79cc6bd01 100644
--- a/packages/jest-haste-map/src/index.js
+++ b/packages/jest-haste-map/src/index.js
@@ -289,8 +289,13 @@ class HasteMap extends EventEmitter {
    * 1. read data from the cache or create an empty structure.
    */
   read(): InternalHasteMap {
-    // This may throw. `_buildFileMap` will catch it and create a new map.
-    const hasteMap: InternalHasteMap = serializer.readFileSync(this._cachePath);
+    let hasteMap: InternalHasteMap;
+
+    try {
+      hasteMap = serializer.readFileSync(this._cachePath);
+    } catch (err) {
+      hasteMap = this._createEmptyMap();
+    }
 
     for (const key in hasteMap) {
       Object.setPrototypeOf(hasteMap[key], null);